Gunfire and explosions have been heard in the Boston suburb of Watertown, Mass., and police have converged on the area. The events there follow the shooting death late Thursday of a campus police officer at the nearby Massachusetts Institute of Technology.

“The chaos in Watertown, about 10 miles west of Boston, occurred just hours after a Massachusetts Institute of Technology police officer was shot and killed on campus. It was unclear if the outbursts of violence were related. …

“The officer had been responding to report of a disturbance Thursday night when he was shot multiple times, according to a statement from the Middlesex district attorney’s office and Cambridge police. It said there were no other victims.

“Meanwhile, in Watertown, witnesses reported hearing multiple gunshots and explosions at about 1 a.m. Friday. Dozens of police officers and FBI agents were in the neighborhood and a helicopter circled overhead.”

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